Chu, Shih-INg, H. T.2014-12-032014-12-032011-08-23Ng, H. T. & Chu, Shih-I. "Steady-state entanglement in a double-well Bose-Einstein condensate through coupling to a superconducting resonator." Phys. Rev. A 84, 023629 – Published 23 August 2011. http://dx.doi.org/10.1103/PhysRevA.84.023629.https://hdl.handle.net/1808/16020This is the published version, also available here: http://dx.doi.org/10.1103/PhysRevA.84.023629.We consider a two-component Bose-Einstein condensate in a double-well potential, where the atoms are magnetically coupled to a single mode of the microwave field inside a superconducting resonator. We find that the system has different dark-state subspaces in the strong- and weak-tunneling regimes. In the limit of weak tunnel coupling, steady-state entanglement between the two spatially separated condensates can be generated by evolving to a mixture of dark states via the dissipation of the photon field. We show that the entanglement can be faithfully indicated by an entanglement witness. Long-lived entangled states are useful for quantum-information processing with atom-chip devices.Article10.1103/PhysRevA.84.023629openAccess